2 * Block driver for RAW files (posix)
4 * Copyright (c) 2006 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 #include "qemu/osdep.h"
25 #include "qapi/error.h"
26 #include "qemu/cutils.h"
27 #include "qemu/error-report.h"
28 #include "qemu/timer.h"
30 #include "block/block_int.h"
31 #include "qemu/module.h"
33 #include "block/thread-pool.h"
35 #include "block/raw-aio.h"
36 #include "qapi/util.h"
37 #include "qapi/qmp/qstring.h"
39 #if defined(__APPLE__) && (__MACH__)
41 #include <sys/param.h>
42 #include <IOKit/IOKitLib.h>
43 #include <IOKit/IOBSD.h>
44 #include <IOKit/storage/IOMediaBSDClient.h>
45 #include <IOKit/storage/IOMedia.h>
46 #include <IOKit/storage/IOCDMedia.h>
47 //#include <IOKit/storage/IOCDTypes.h>
48 #include <IOKit/storage/IODVDMedia.h>
49 #include <CoreFoundation/CoreFoundation.h>
53 #define _POSIX_PTHREAD_SEMANTICS 1
57 #include <sys/ioctl.h>
58 #include <sys/param.h>
59 #include <linux/cdrom.h>
62 #include <linux/hdreg.h>
68 #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
71 #if defined(CONFIG_FALLOCATE_PUNCH_HOLE) || defined(CONFIG_FALLOCATE_ZERO_RANGE)
72 #include <linux/falloc.h>
74 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
80 #include <sys/ioctl.h>
81 #include <sys/disklabel.h>
86 #include <sys/ioctl.h>
87 #include <sys/disklabel.h>
93 #include <sys/ioctl.h>
94 #include <sys/diskslice.h>
101 //#define DEBUG_BLOCK
104 # define DEBUG_BLOCK_PRINT 1
106 # define DEBUG_BLOCK_PRINT 0
108 #define DPRINTF(fmt, ...) \
110 if (DEBUG_BLOCK_PRINT) { \
111 printf(fmt, ## __VA_ARGS__); \
115 /* OS X does not have O_DSYNC */
118 #define O_DSYNC O_SYNC
119 #elif defined(O_FSYNC)
120 #define O_DSYNC O_FSYNC
124 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
126 #define O_DIRECT O_DSYNC
132 #define MAX_BLOCKSIZE 4096
134 typedef struct BDRVRawState
{
144 bool has_write_zeroes
:1;
145 bool discard_zeroes
:1;
146 bool use_linux_aio
:1;
148 bool needs_alignment
;
151 typedef struct BDRVRawReopenState
{
154 } BDRVRawReopenState
;
156 static int fd_open(BlockDriverState
*bs
);
157 static int64_t raw_getlength(BlockDriverState
*bs
);
159 typedef struct RawPosixAIOData
{
160 BlockDriverState
*bs
;
163 struct iovec
*aio_iov
;
168 #define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */
173 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
174 static int cdrom_reopen(BlockDriverState
*bs
);
177 #if defined(__NetBSD__)
178 static int raw_normalize_devicepath(const char **filename
)
180 static char namebuf
[PATH_MAX
];
181 const char *dp
, *fname
;
185 dp
= strrchr(fname
, '/');
186 if (lstat(fname
, &sb
) < 0) {
187 fprintf(stderr
, "%s: stat failed: %s\n",
188 fname
, strerror(errno
));
192 if (!S_ISBLK(sb
.st_mode
)) {
197 snprintf(namebuf
, PATH_MAX
, "r%s", fname
);
199 snprintf(namebuf
, PATH_MAX
, "%.*s/r%s",
200 (int)(dp
- fname
), fname
, dp
+ 1);
202 fprintf(stderr
, "%s is a block device", fname
);
204 fprintf(stderr
, ", using %s\n", *filename
);
209 static int raw_normalize_devicepath(const char **filename
)
216 * Get logical block size via ioctl. On success store it in @sector_size_p.
218 static int probe_logical_blocksize(int fd
, unsigned int *sector_size_p
)
220 unsigned int sector_size
;
221 bool success
= false;
225 /* Try a few ioctls to get the right size */
227 if (ioctl(fd
, BLKSSZGET
, §or_size
) >= 0) {
228 *sector_size_p
= sector_size
;
232 #ifdef DKIOCGETBLOCKSIZE
233 if (ioctl(fd
, DKIOCGETBLOCKSIZE
, §or_size
) >= 0) {
234 *sector_size_p
= sector_size
;
238 #ifdef DIOCGSECTORSIZE
239 if (ioctl(fd
, DIOCGSECTORSIZE
, §or_size
) >= 0) {
240 *sector_size_p
= sector_size
;
245 return success
? 0 : -errno
;
249 * Get physical block size of @fd.
250 * On success, store it in @blk_size and return 0.
251 * On failure, return -errno.
253 static int probe_physical_blocksize(int fd
, unsigned int *blk_size
)
256 if (ioctl(fd
, BLKPBSZGET
, blk_size
) < 0) {
265 /* Check if read is allowed with given memory buffer and length.
267 * This function is used to check O_DIRECT memory buffer and request alignment.
269 static bool raw_is_io_aligned(int fd
, void *buf
, size_t len
)
271 ssize_t ret
= pread(fd
, buf
, len
, 0);
278 /* The Linux kernel returns EINVAL for misaligned O_DIRECT reads. Ignore
279 * other errors (e.g. real I/O error), which could happen on a failed
280 * drive, since we only care about probing alignment.
282 if (errno
!= EINVAL
) {
290 static void raw_probe_alignment(BlockDriverState
*bs
, int fd
, Error
**errp
)
292 BDRVRawState
*s
= bs
->opaque
;
294 size_t max_align
= MAX(MAX_BLOCKSIZE
, getpagesize());
296 /* For SCSI generic devices the alignment is not really used.
297 With buffered I/O, we don't have any restrictions. */
298 if (bdrv_is_sg(bs
) || !s
->needs_alignment
) {
299 bs
->bl
.request_alignment
= 1;
304 bs
->bl
.request_alignment
= 0;
306 /* Let's try to use the logical blocksize for the alignment. */
307 if (probe_logical_blocksize(fd
, &bs
->bl
.request_alignment
) < 0) {
308 bs
->bl
.request_alignment
= 0;
313 if (xfsctl(NULL
, fd
, XFS_IOC_DIOINFO
, &da
) >= 0) {
314 bs
->bl
.request_alignment
= da
.d_miniosz
;
315 /* The kernel returns wrong information for d_mem */
316 /* s->buf_align = da.d_mem; */
321 /* If we could not get the sizes so far, we can only guess them */
324 buf
= qemu_memalign(max_align
, 2 * max_align
);
325 for (align
= 512; align
<= max_align
; align
<<= 1) {
326 if (raw_is_io_aligned(fd
, buf
+ align
, max_align
)) {
327 s
->buf_align
= align
;
334 if (!bs
->bl
.request_alignment
) {
336 buf
= qemu_memalign(s
->buf_align
, max_align
);
337 for (align
= 512; align
<= max_align
; align
<<= 1) {
338 if (raw_is_io_aligned(fd
, buf
, align
)) {
339 bs
->bl
.request_alignment
= align
;
346 if (!s
->buf_align
|| !bs
->bl
.request_alignment
) {
347 error_setg(errp
, "Could not find working O_DIRECT alignment");
348 error_append_hint(errp
, "Try cache.direct=off\n");
352 static void raw_parse_flags(int bdrv_flags
, int *open_flags
)
354 assert(open_flags
!= NULL
);
356 *open_flags
|= O_BINARY
;
357 *open_flags
&= ~O_ACCMODE
;
358 if (bdrv_flags
& BDRV_O_RDWR
) {
359 *open_flags
|= O_RDWR
;
361 *open_flags
|= O_RDONLY
;
364 /* Use O_DSYNC for write-through caching, no flags for write-back caching,
365 * and O_DIRECT for no caching. */
366 if ((bdrv_flags
& BDRV_O_NOCACHE
)) {
367 *open_flags
|= O_DIRECT
;
371 static void raw_parse_filename(const char *filename
, QDict
*options
,
374 /* The filename does not have to be prefixed by the protocol name, since
375 * "file" is the default protocol; therefore, the return value of this
376 * function call can be ignored. */
377 strstart(filename
, "file:", &filename
);
379 qdict_put_obj(options
, "filename", QOBJECT(qstring_from_str(filename
)));
382 static QemuOptsList raw_runtime_opts
= {
384 .head
= QTAILQ_HEAD_INITIALIZER(raw_runtime_opts
.head
),
388 .type
= QEMU_OPT_STRING
,
389 .help
= "File name of the image",
393 .type
= QEMU_OPT_STRING
,
394 .help
= "host AIO implementation (threads, native)",
396 { /* end of list */ }
400 static int raw_open_common(BlockDriverState
*bs
, QDict
*options
,
401 int bdrv_flags
, int open_flags
, Error
**errp
)
403 BDRVRawState
*s
= bs
->opaque
;
405 Error
*local_err
= NULL
;
406 const char *filename
= NULL
;
407 BlockdevAioOptions aio
, aio_default
;
411 opts
= qemu_opts_create(&raw_runtime_opts
, NULL
, 0, &error_abort
);
412 qemu_opts_absorb_qdict(opts
, options
, &local_err
);
414 error_propagate(errp
, local_err
);
419 filename
= qemu_opt_get(opts
, "filename");
421 ret
= raw_normalize_devicepath(&filename
);
423 error_setg_errno(errp
, -ret
, "Could not normalize device path");
427 aio_default
= (bdrv_flags
& BDRV_O_NATIVE_AIO
)
428 ? BLOCKDEV_AIO_OPTIONS_NATIVE
429 : BLOCKDEV_AIO_OPTIONS_THREADS
;
430 aio
= qapi_enum_parse(BlockdevAioOptions_lookup
, qemu_opt_get(opts
, "aio"),
431 BLOCKDEV_AIO_OPTIONS__MAX
, aio_default
, &local_err
);
433 error_propagate(errp
, local_err
);
437 s
->use_linux_aio
= (aio
== BLOCKDEV_AIO_OPTIONS_NATIVE
);
439 s
->open_flags
= open_flags
;
440 raw_parse_flags(bdrv_flags
, &s
->open_flags
);
443 fd
= qemu_open(filename
, s
->open_flags
, 0644);
446 error_setg_errno(errp
, errno
, "Could not open '%s'", filename
);
454 #ifdef CONFIG_LINUX_AIO
455 /* Currently Linux does AIO only for files opened with O_DIRECT */
456 if (s
->use_linux_aio
&& !(s
->open_flags
& O_DIRECT
)) {
457 error_setg(errp
, "aio=native was specified, but it requires "
458 "cache.direct=on, which was not specified.");
463 if (s
->use_linux_aio
) {
464 error_setg(errp
, "aio=native was specified, but is not supported "
469 #endif /* !defined(CONFIG_LINUX_AIO) */
471 s
->has_discard
= true;
472 s
->has_write_zeroes
= true;
473 bs
->supported_zero_flags
= BDRV_REQ_MAY_UNMAP
;
474 if ((bs
->open_flags
& BDRV_O_NOCACHE
) != 0) {
475 s
->needs_alignment
= true;
478 if (fstat(s
->fd
, &st
) < 0) {
480 error_setg_errno(errp
, errno
, "Could not stat file");
483 if (S_ISREG(st
.st_mode
)) {
484 s
->discard_zeroes
= true;
485 s
->has_fallocate
= true;
487 if (S_ISBLK(st
.st_mode
)) {
488 #ifdef BLKDISCARDZEROES
490 if (ioctl(s
->fd
, BLKDISCARDZEROES
, &arg
) == 0 && arg
) {
491 s
->discard_zeroes
= true;
495 /* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do
496 * not rely on the contents of discarded blocks unless using O_DIRECT.
497 * Same for BLKZEROOUT.
499 if (!(bs
->open_flags
& BDRV_O_NOCACHE
)) {
500 s
->discard_zeroes
= false;
501 s
->has_write_zeroes
= false;
506 if (S_ISCHR(st
.st_mode
)) {
508 * The file is a char device (disk), which on FreeBSD isn't behind
509 * a pager, so force all requests to be aligned. This is needed
510 * so QEMU makes sure all IO operations on the device are aligned
511 * to sector size, or else FreeBSD will reject them with EINVAL.
513 s
->needs_alignment
= true;
518 if (platform_test_xfs_fd(s
->fd
)) {
525 if (filename
&& (bdrv_flags
& BDRV_O_TEMPORARY
)) {
532 static int raw_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
535 BDRVRawState
*s
= bs
->opaque
;
537 s
->type
= FTYPE_FILE
;
538 return raw_open_common(bs
, options
, flags
, 0, errp
);
541 static int raw_reopen_prepare(BDRVReopenState
*state
,
542 BlockReopenQueue
*queue
, Error
**errp
)
545 BDRVRawReopenState
*rs
;
547 Error
*local_err
= NULL
;
549 assert(state
!= NULL
);
550 assert(state
->bs
!= NULL
);
552 s
= state
->bs
->opaque
;
554 state
->opaque
= g_new0(BDRVRawReopenState
, 1);
557 if (s
->type
== FTYPE_CD
) {
558 rs
->open_flags
|= O_NONBLOCK
;
561 raw_parse_flags(state
->flags
, &rs
->open_flags
);
565 int fcntl_flags
= O_APPEND
| O_NONBLOCK
;
567 fcntl_flags
|= O_NOATIME
;
571 /* Not all operating systems have O_ASYNC, and those that don't
572 * will not let us track the state into rs->open_flags (typically
573 * you achieve the same effect with an ioctl, for example I_SETSIG
574 * on Solaris). But we do not use O_ASYNC, so that's fine.
576 assert((s
->open_flags
& O_ASYNC
) == 0);
579 if ((rs
->open_flags
& ~fcntl_flags
) == (s
->open_flags
& ~fcntl_flags
)) {
580 /* dup the original fd */
581 rs
->fd
= qemu_dup(s
->fd
);
583 ret
= fcntl_setfl(rs
->fd
, rs
->open_flags
);
591 /* If we cannot use fcntl, or fcntl failed, fall back to qemu_open() */
593 const char *normalized_filename
= state
->bs
->filename
;
594 ret
= raw_normalize_devicepath(&normalized_filename
);
596 error_setg_errno(errp
, -ret
, "Could not normalize device path");
598 assert(!(rs
->open_flags
& O_CREAT
));
599 rs
->fd
= qemu_open(normalized_filename
, rs
->open_flags
);
601 error_setg_errno(errp
, errno
, "Could not reopen file");
607 /* Fail already reopen_prepare() if we can't get a working O_DIRECT
608 * alignment with the new fd. */
610 raw_probe_alignment(state
->bs
, rs
->fd
, &local_err
);
614 error_propagate(errp
, local_err
);
622 static void raw_reopen_commit(BDRVReopenState
*state
)
624 BDRVRawReopenState
*rs
= state
->opaque
;
625 BDRVRawState
*s
= state
->bs
->opaque
;
627 s
->open_flags
= rs
->open_flags
;
632 g_free(state
->opaque
);
633 state
->opaque
= NULL
;
637 static void raw_reopen_abort(BDRVReopenState
*state
)
639 BDRVRawReopenState
*rs
= state
->opaque
;
641 /* nothing to do if NULL, we didn't get far enough */
650 g_free(state
->opaque
);
651 state
->opaque
= NULL
;
654 static int hdev_get_max_transfer_length(BlockDriverState
*bs
, int fd
)
658 short max_sectors
= 0;
659 if (bs
->sg
&& ioctl(fd
, BLKSECTGET
, &max_bytes
) == 0) {
661 } else if (!bs
->sg
&& ioctl(fd
, BLKSECTGET
, &max_sectors
) == 0) {
662 return max_sectors
<< BDRV_SECTOR_BITS
;
671 static int hdev_get_max_segments(const struct stat
*st
)
681 sysfspath
= g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments",
682 major(st
->st_rdev
), minor(st
->st_rdev
));
683 fd
= open(sysfspath
, O_RDONLY
);
689 ret
= read(fd
, buf
, sizeof(buf
));
690 } while (ret
== -1 && errno
== EINTR
);
694 } else if (ret
== 0) {
699 /* The file is ended with '\n', pass 'end' to accept that. */
700 ret
= qemu_strtol(buf
, &end
, 10, &max_segments
);
701 if (ret
== 0 && end
&& *end
== '\n') {
713 static void raw_refresh_limits(BlockDriverState
*bs
, Error
**errp
)
715 BDRVRawState
*s
= bs
->opaque
;
718 if (!fstat(s
->fd
, &st
)) {
719 if (S_ISBLK(st
.st_mode
) || S_ISCHR(st
.st_mode
)) {
720 int ret
= hdev_get_max_transfer_length(bs
, s
->fd
);
721 if (ret
> 0 && ret
<= BDRV_REQUEST_MAX_BYTES
) {
722 bs
->bl
.max_transfer
= pow2floor(ret
);
724 ret
= hdev_get_max_segments(&st
);
726 bs
->bl
.max_transfer
= MIN(bs
->bl
.max_transfer
,
727 ret
* getpagesize());
732 raw_probe_alignment(bs
, s
->fd
, errp
);
733 bs
->bl
.min_mem_alignment
= s
->buf_align
;
734 bs
->bl
.opt_mem_alignment
= MAX(s
->buf_align
, getpagesize());
737 static int check_for_dasd(int fd
)
740 struct dasd_information2_t info
= {0};
742 return ioctl(fd
, BIODASDINFO2
, &info
);
749 * Try to get @bs's logical and physical block size.
750 * On success, store them in @bsz and return zero.
751 * On failure, return negative errno.
753 static int hdev_probe_blocksizes(BlockDriverState
*bs
, BlockSizes
*bsz
)
755 BDRVRawState
*s
= bs
->opaque
;
758 /* If DASD, get blocksizes */
759 if (check_for_dasd(s
->fd
) < 0) {
762 ret
= probe_logical_blocksize(s
->fd
, &bsz
->log
);
766 return probe_physical_blocksize(s
->fd
, &bsz
->phys
);
770 * Try to get @bs's geometry: cyls, heads, sectors.
771 * On success, store them in @geo and return 0.
772 * On failure return -errno.
773 * (Allows block driver to assign default geometry values that guest sees)
776 static int hdev_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
)
778 BDRVRawState
*s
= bs
->opaque
;
779 struct hd_geometry ioctl_geo
= {0};
781 /* If DASD, get its geometry */
782 if (check_for_dasd(s
->fd
) < 0) {
785 if (ioctl(s
->fd
, HDIO_GETGEO
, &ioctl_geo
) < 0) {
788 /* HDIO_GETGEO may return success even though geo contains zeros
789 (e.g. certain multipath setups) */
790 if (!ioctl_geo
.heads
|| !ioctl_geo
.sectors
|| !ioctl_geo
.cylinders
) {
793 /* Do not return a geometry for partition */
794 if (ioctl_geo
.start
!= 0) {
797 geo
->heads
= ioctl_geo
.heads
;
798 geo
->sectors
= ioctl_geo
.sectors
;
799 geo
->cylinders
= ioctl_geo
.cylinders
;
803 #else /* __linux__ */
804 static int hdev_probe_geometry(BlockDriverState
*bs
, HDGeometry
*geo
)
810 static ssize_t
handle_aiocb_ioctl(RawPosixAIOData
*aiocb
)
814 ret
= ioctl(aiocb
->aio_fildes
, aiocb
->aio_ioctl_cmd
, aiocb
->aio_ioctl_buf
);
822 static ssize_t
handle_aiocb_flush(RawPosixAIOData
*aiocb
)
826 ret
= qemu_fdatasync(aiocb
->aio_fildes
);
835 static bool preadv_present
= true;
838 qemu_preadv(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
840 return preadv(fd
, iov
, nr_iov
, offset
);
844 qemu_pwritev(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
846 return pwritev(fd
, iov
, nr_iov
, offset
);
851 static bool preadv_present
= false;
854 qemu_preadv(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
860 qemu_pwritev(int fd
, const struct iovec
*iov
, int nr_iov
, off_t offset
)
867 static ssize_t
handle_aiocb_rw_vector(RawPosixAIOData
*aiocb
)
872 if (aiocb
->aio_type
& QEMU_AIO_WRITE
)
873 len
= qemu_pwritev(aiocb
->aio_fildes
,
878 len
= qemu_preadv(aiocb
->aio_fildes
,
882 } while (len
== -1 && errno
== EINTR
);
891 * Read/writes the data to/from a given linear buffer.
893 * Returns the number of bytes handles or -errno in case of an error. Short
894 * reads are only returned if the end of the file is reached.
896 static ssize_t
handle_aiocb_rw_linear(RawPosixAIOData
*aiocb
, char *buf
)
901 while (offset
< aiocb
->aio_nbytes
) {
902 if (aiocb
->aio_type
& QEMU_AIO_WRITE
) {
903 len
= pwrite(aiocb
->aio_fildes
,
904 (const char *)buf
+ offset
,
905 aiocb
->aio_nbytes
- offset
,
906 aiocb
->aio_offset
+ offset
);
908 len
= pread(aiocb
->aio_fildes
,
910 aiocb
->aio_nbytes
- offset
,
911 aiocb
->aio_offset
+ offset
);
913 if (len
== -1 && errno
== EINTR
) {
915 } else if (len
== -1 && errno
== EINVAL
&&
916 (aiocb
->bs
->open_flags
& BDRV_O_NOCACHE
) &&
917 !(aiocb
->aio_type
& QEMU_AIO_WRITE
) &&
919 /* O_DIRECT pread() may fail with EINVAL when offset is unaligned
920 * after a short read. Assume that O_DIRECT short reads only occur
921 * at EOF. Therefore this is a short read, not an I/O error.
924 } else if (len
== -1) {
927 } else if (len
== 0) {
936 static ssize_t
handle_aiocb_rw(RawPosixAIOData
*aiocb
)
941 if (!(aiocb
->aio_type
& QEMU_AIO_MISALIGNED
)) {
943 * If there is just a single buffer, and it is properly aligned
944 * we can just use plain pread/pwrite without any problems.
946 if (aiocb
->aio_niov
== 1) {
947 return handle_aiocb_rw_linear(aiocb
, aiocb
->aio_iov
->iov_base
);
950 * We have more than one iovec, and all are properly aligned.
952 * Try preadv/pwritev first and fall back to linearizing the
953 * buffer if it's not supported.
955 if (preadv_present
) {
956 nbytes
= handle_aiocb_rw_vector(aiocb
);
957 if (nbytes
== aiocb
->aio_nbytes
||
958 (nbytes
< 0 && nbytes
!= -ENOSYS
)) {
961 preadv_present
= false;
965 * XXX(hch): short read/write. no easy way to handle the reminder
966 * using these interfaces. For now retry using plain
972 * Ok, we have to do it the hard way, copy all segments into
973 * a single aligned buffer.
975 buf
= qemu_try_blockalign(aiocb
->bs
, aiocb
->aio_nbytes
);
980 if (aiocb
->aio_type
& QEMU_AIO_WRITE
) {
984 for (i
= 0; i
< aiocb
->aio_niov
; ++i
) {
985 memcpy(p
, aiocb
->aio_iov
[i
].iov_base
, aiocb
->aio_iov
[i
].iov_len
);
986 p
+= aiocb
->aio_iov
[i
].iov_len
;
988 assert(p
- buf
== aiocb
->aio_nbytes
);
991 nbytes
= handle_aiocb_rw_linear(aiocb
, buf
);
992 if (!(aiocb
->aio_type
& QEMU_AIO_WRITE
)) {
994 size_t count
= aiocb
->aio_nbytes
, copy
;
997 for (i
= 0; i
< aiocb
->aio_niov
&& count
; ++i
) {
999 if (copy
> aiocb
->aio_iov
[i
].iov_len
) {
1000 copy
= aiocb
->aio_iov
[i
].iov_len
;
1002 memcpy(aiocb
->aio_iov
[i
].iov_base
, p
, copy
);
1003 assert(count
>= copy
);
1015 static int xfs_write_zeroes(BDRVRawState
*s
, int64_t offset
, uint64_t bytes
)
1017 struct xfs_flock64 fl
;
1020 memset(&fl
, 0, sizeof(fl
));
1021 fl
.l_whence
= SEEK_SET
;
1022 fl
.l_start
= offset
;
1025 if (xfsctl(NULL
, s
->fd
, XFS_IOC_ZERO_RANGE
, &fl
) < 0) {
1027 DPRINTF("cannot write zero range (%s)\n", strerror(errno
));
1034 static int xfs_discard(BDRVRawState
*s
, int64_t offset
, uint64_t bytes
)
1036 struct xfs_flock64 fl
;
1039 memset(&fl
, 0, sizeof(fl
));
1040 fl
.l_whence
= SEEK_SET
;
1041 fl
.l_start
= offset
;
1044 if (xfsctl(NULL
, s
->fd
, XFS_IOC_UNRESVSP64
, &fl
) < 0) {
1046 DPRINTF("cannot punch hole (%s)\n", strerror(errno
));
1054 static int translate_err(int err
)
1056 if (err
== -ENODEV
|| err
== -ENOSYS
|| err
== -EOPNOTSUPP
||
1063 #ifdef CONFIG_FALLOCATE
1064 static int do_fallocate(int fd
, int mode
, off_t offset
, off_t len
)
1067 if (fallocate(fd
, mode
, offset
, len
) == 0) {
1070 } while (errno
== EINTR
);
1071 return translate_err(-errno
);
1075 static ssize_t
handle_aiocb_write_zeroes_block(RawPosixAIOData
*aiocb
)
1078 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1080 if (!s
->has_write_zeroes
) {
1086 uint64_t range
[2] = { aiocb
->aio_offset
, aiocb
->aio_nbytes
};
1087 if (ioctl(aiocb
->aio_fildes
, BLKZEROOUT
, range
) == 0) {
1090 } while (errno
== EINTR
);
1092 ret
= translate_err(-errno
);
1095 if (ret
== -ENOTSUP
) {
1096 s
->has_write_zeroes
= false;
1101 static ssize_t
handle_aiocb_write_zeroes(RawPosixAIOData
*aiocb
)
1103 #if defined(CONFIG_FALLOCATE) || defined(CONFIG_XFS)
1104 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1107 if (aiocb
->aio_type
& QEMU_AIO_BLKDEV
) {
1108 return handle_aiocb_write_zeroes_block(aiocb
);
1113 return xfs_write_zeroes(s
, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1117 #ifdef CONFIG_FALLOCATE_ZERO_RANGE
1118 if (s
->has_write_zeroes
) {
1119 int ret
= do_fallocate(s
->fd
, FALLOC_FL_ZERO_RANGE
,
1120 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1121 if (ret
== 0 || ret
!= -ENOTSUP
) {
1124 s
->has_write_zeroes
= false;
1128 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1129 if (s
->has_discard
&& s
->has_fallocate
) {
1130 int ret
= do_fallocate(s
->fd
,
1131 FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
,
1132 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1134 ret
= do_fallocate(s
->fd
, 0, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1135 if (ret
== 0 || ret
!= -ENOTSUP
) {
1138 s
->has_fallocate
= false;
1139 } else if (ret
!= -ENOTSUP
) {
1142 s
->has_discard
= false;
1147 #ifdef CONFIG_FALLOCATE
1148 if (s
->has_fallocate
&& aiocb
->aio_offset
>= bdrv_getlength(aiocb
->bs
)) {
1149 int ret
= do_fallocate(s
->fd
, 0, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1150 if (ret
== 0 || ret
!= -ENOTSUP
) {
1153 s
->has_fallocate
= false;
1160 static ssize_t
handle_aiocb_discard(RawPosixAIOData
*aiocb
)
1162 int ret
= -EOPNOTSUPP
;
1163 BDRVRawState
*s
= aiocb
->bs
->opaque
;
1165 if (!s
->has_discard
) {
1169 if (aiocb
->aio_type
& QEMU_AIO_BLKDEV
) {
1172 uint64_t range
[2] = { aiocb
->aio_offset
, aiocb
->aio_nbytes
};
1173 if (ioctl(aiocb
->aio_fildes
, BLKDISCARD
, range
) == 0) {
1176 } while (errno
== EINTR
);
1183 return xfs_discard(s
, aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1187 #ifdef CONFIG_FALLOCATE_PUNCH_HOLE
1188 ret
= do_fallocate(s
->fd
, FALLOC_FL_PUNCH_HOLE
| FALLOC_FL_KEEP_SIZE
,
1189 aiocb
->aio_offset
, aiocb
->aio_nbytes
);
1193 ret
= translate_err(ret
);
1194 if (ret
== -ENOTSUP
) {
1195 s
->has_discard
= false;
1200 static int aio_worker(void *arg
)
1202 RawPosixAIOData
*aiocb
= arg
;
1205 switch (aiocb
->aio_type
& QEMU_AIO_TYPE_MASK
) {
1207 ret
= handle_aiocb_rw(aiocb
);
1208 if (ret
>= 0 && ret
< aiocb
->aio_nbytes
) {
1209 iov_memset(aiocb
->aio_iov
, aiocb
->aio_niov
, ret
,
1210 0, aiocb
->aio_nbytes
- ret
);
1212 ret
= aiocb
->aio_nbytes
;
1214 if (ret
== aiocb
->aio_nbytes
) {
1216 } else if (ret
>= 0 && ret
< aiocb
->aio_nbytes
) {
1220 case QEMU_AIO_WRITE
:
1221 ret
= handle_aiocb_rw(aiocb
);
1222 if (ret
== aiocb
->aio_nbytes
) {
1224 } else if (ret
>= 0 && ret
< aiocb
->aio_nbytes
) {
1228 case QEMU_AIO_FLUSH
:
1229 ret
= handle_aiocb_flush(aiocb
);
1231 case QEMU_AIO_IOCTL
:
1232 ret
= handle_aiocb_ioctl(aiocb
);
1234 case QEMU_AIO_DISCARD
:
1235 ret
= handle_aiocb_discard(aiocb
);
1237 case QEMU_AIO_WRITE_ZEROES
:
1238 ret
= handle_aiocb_write_zeroes(aiocb
);
1241 fprintf(stderr
, "invalid aio request (0x%x)\n", aiocb
->aio_type
);
1250 static int paio_submit_co(BlockDriverState
*bs
, int fd
,
1251 int64_t offset
, QEMUIOVector
*qiov
,
1252 int count
, int type
)
1254 RawPosixAIOData
*acb
= g_new(RawPosixAIOData
, 1);
1258 acb
->aio_type
= type
;
1259 acb
->aio_fildes
= fd
;
1261 acb
->aio_nbytes
= count
;
1262 acb
->aio_offset
= offset
;
1265 acb
->aio_iov
= qiov
->iov
;
1266 acb
->aio_niov
= qiov
->niov
;
1267 assert(qiov
->size
== count
);
1270 trace_paio_submit_co(offset
, count
, type
);
1271 pool
= aio_get_thread_pool(bdrv_get_aio_context(bs
));
1272 return thread_pool_submit_co(pool
, aio_worker
, acb
);
1275 static BlockAIOCB
*paio_submit(BlockDriverState
*bs
, int fd
,
1276 int64_t offset
, QEMUIOVector
*qiov
, int count
,
1277 BlockCompletionFunc
*cb
, void *opaque
, int type
)
1279 RawPosixAIOData
*acb
= g_new(RawPosixAIOData
, 1);
1283 acb
->aio_type
= type
;
1284 acb
->aio_fildes
= fd
;
1286 acb
->aio_nbytes
= count
;
1287 acb
->aio_offset
= offset
;
1290 acb
->aio_iov
= qiov
->iov
;
1291 acb
->aio_niov
= qiov
->niov
;
1292 assert(qiov
->size
== acb
->aio_nbytes
);
1295 trace_paio_submit(acb
, opaque
, offset
, count
, type
);
1296 pool
= aio_get_thread_pool(bdrv_get_aio_context(bs
));
1297 return thread_pool_submit_aio(pool
, aio_worker
, acb
, cb
, opaque
);
1300 static int coroutine_fn
raw_co_prw(BlockDriverState
*bs
, uint64_t offset
,
1301 uint64_t bytes
, QEMUIOVector
*qiov
, int type
)
1303 BDRVRawState
*s
= bs
->opaque
;
1305 if (fd_open(bs
) < 0)
1309 * Check if the underlying device requires requests to be aligned,
1310 * and if the request we are trying to submit is aligned or not.
1311 * If this is the case tell the low-level driver that it needs
1312 * to copy the buffer.
1314 if (s
->needs_alignment
) {
1315 if (!bdrv_qiov_is_aligned(bs
, qiov
)) {
1316 type
|= QEMU_AIO_MISALIGNED
;
1317 #ifdef CONFIG_LINUX_AIO
1318 } else if (s
->use_linux_aio
) {
1319 LinuxAioState
*aio
= aio_get_linux_aio(bdrv_get_aio_context(bs
));
1320 assert(qiov
->size
== bytes
);
1321 return laio_co_submit(bs
, aio
, s
->fd
, offset
, qiov
, type
);
1326 return paio_submit_co(bs
, s
->fd
, offset
, qiov
, bytes
, type
);
1329 static int coroutine_fn
raw_co_preadv(BlockDriverState
*bs
, uint64_t offset
,
1330 uint64_t bytes
, QEMUIOVector
*qiov
,
1333 return raw_co_prw(bs
, offset
, bytes
, qiov
, QEMU_AIO_READ
);
1336 static int coroutine_fn
raw_co_pwritev(BlockDriverState
*bs
, uint64_t offset
,
1337 uint64_t bytes
, QEMUIOVector
*qiov
,
1341 return raw_co_prw(bs
, offset
, bytes
, qiov
, QEMU_AIO_WRITE
);
1344 static void raw_aio_plug(BlockDriverState
*bs
)
1346 #ifdef CONFIG_LINUX_AIO
1347 BDRVRawState
*s
= bs
->opaque
;
1348 if (s
->use_linux_aio
) {
1349 LinuxAioState
*aio
= aio_get_linux_aio(bdrv_get_aio_context(bs
));
1350 laio_io_plug(bs
, aio
);
1355 static void raw_aio_unplug(BlockDriverState
*bs
)
1357 #ifdef CONFIG_LINUX_AIO
1358 BDRVRawState
*s
= bs
->opaque
;
1359 if (s
->use_linux_aio
) {
1360 LinuxAioState
*aio
= aio_get_linux_aio(bdrv_get_aio_context(bs
));
1361 laio_io_unplug(bs
, aio
);
1366 static BlockAIOCB
*raw_aio_flush(BlockDriverState
*bs
,
1367 BlockCompletionFunc
*cb
, void *opaque
)
1369 BDRVRawState
*s
= bs
->opaque
;
1371 if (fd_open(bs
) < 0)
1374 return paio_submit(bs
, s
->fd
, 0, NULL
, 0, cb
, opaque
, QEMU_AIO_FLUSH
);
1377 static void raw_close(BlockDriverState
*bs
)
1379 BDRVRawState
*s
= bs
->opaque
;
1387 static int raw_truncate(BlockDriverState
*bs
, int64_t offset
)
1389 BDRVRawState
*s
= bs
->opaque
;
1392 if (fstat(s
->fd
, &st
)) {
1396 if (S_ISREG(st
.st_mode
)) {
1397 if (ftruncate(s
->fd
, offset
) < 0) {
1400 } else if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
1401 if (offset
> raw_getlength(bs
)) {
1412 static int64_t raw_getlength(BlockDriverState
*bs
)
1414 BDRVRawState
*s
= bs
->opaque
;
1420 if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
1421 struct disklabel dl
;
1423 if (ioctl(fd
, DIOCGDINFO
, &dl
))
1425 return (uint64_t)dl
.d_secsize
*
1426 dl
.d_partitions
[DISKPART(st
.st_rdev
)].p_size
;
1430 #elif defined(__NetBSD__)
1431 static int64_t raw_getlength(BlockDriverState
*bs
)
1433 BDRVRawState
*s
= bs
->opaque
;
1439 if (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
)) {
1440 struct dkwedge_info dkw
;
1442 if (ioctl(fd
, DIOCGWEDGEINFO
, &dkw
) != -1) {
1443 return dkw
.dkw_size
* 512;
1445 struct disklabel dl
;
1447 if (ioctl(fd
, DIOCGDINFO
, &dl
))
1449 return (uint64_t)dl
.d_secsize
*
1450 dl
.d_partitions
[DISKPART(st
.st_rdev
)].p_size
;
1455 #elif defined(__sun__)
1456 static int64_t raw_getlength(BlockDriverState
*bs
)
1458 BDRVRawState
*s
= bs
->opaque
;
1459 struct dk_minfo minfo
;
1469 * Use the DKIOCGMEDIAINFO ioctl to read the size.
1471 ret
= ioctl(s
->fd
, DKIOCGMEDIAINFO
, &minfo
);
1473 return minfo
.dki_lbsize
* minfo
.dki_capacity
;
1477 * There are reports that lseek on some devices fails, but
1478 * irc discussion said that contingency on contingency was overkill.
1480 size
= lseek(s
->fd
, 0, SEEK_END
);
1486 #elif defined(CONFIG_BSD)
1487 static int64_t raw_getlength(BlockDriverState
*bs
)
1489 BDRVRawState
*s
= bs
->opaque
;
1493 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1502 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1505 if (!fstat(fd
, &sb
) && (S_IFCHR
& sb
.st_mode
)) {
1506 #ifdef DIOCGMEDIASIZE
1507 if (ioctl(fd
, DIOCGMEDIASIZE
, (off_t
*)&size
))
1508 #elif defined(DIOCGPART)
1511 if (ioctl(fd
, DIOCGPART
, &pi
) == 0)
1512 size
= pi
.media_size
;
1518 #if defined(__APPLE__) && defined(__MACH__)
1520 uint64_t sectors
= 0;
1521 uint32_t sector_size
= 0;
1523 if (ioctl(fd
, DKIOCGETBLOCKCOUNT
, §ors
) == 0
1524 && ioctl(fd
, DKIOCGETBLOCKSIZE
, §or_size
) == 0) {
1525 size
= sectors
* sector_size
;
1527 size
= lseek(fd
, 0LL, SEEK_END
);
1534 size
= lseek(fd
, 0LL, SEEK_END
);
1539 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1542 /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
1543 if (size
== 2048LL * (unsigned)-1)
1545 /* XXX no disc? maybe we need to reopen... */
1546 if (size
<= 0 && !reopened
&& cdrom_reopen(bs
) >= 0) {
1553 size
= lseek(fd
, 0, SEEK_END
);
1561 static int64_t raw_getlength(BlockDriverState
*bs
)
1563 BDRVRawState
*s
= bs
->opaque
;
1572 size
= lseek(s
->fd
, 0, SEEK_END
);
1580 static int64_t raw_get_allocated_file_size(BlockDriverState
*bs
)
1583 BDRVRawState
*s
= bs
->opaque
;
1585 if (fstat(s
->fd
, &st
) < 0) {
1588 return (int64_t)st
.st_blocks
* 512;
1591 static int raw_create(const char *filename
, QemuOpts
*opts
, Error
**errp
)
1595 int64_t total_size
= 0;
1597 PreallocMode prealloc
;
1599 Error
*local_err
= NULL
;
1601 strstart(filename
, "file:", &filename
);
1603 /* Read out options */
1604 total_size
= ROUND_UP(qemu_opt_get_size_del(opts
, BLOCK_OPT_SIZE
, 0),
1606 nocow
= qemu_opt_get_bool(opts
, BLOCK_OPT_NOCOW
, false);
1607 buf
= qemu_opt_get_del(opts
, BLOCK_OPT_PREALLOC
);
1608 prealloc
= qapi_enum_parse(PreallocMode_lookup
, buf
,
1609 PREALLOC_MODE__MAX
, PREALLOC_MODE_OFF
,
1613 error_propagate(errp
, local_err
);
1618 fd
= qemu_open(filename
, O_RDWR
| O_CREAT
| O_TRUNC
| O_BINARY
,
1622 error_setg_errno(errp
, -result
, "Could not create file");
1628 /* Set NOCOW flag to solve performance issue on fs like btrfs.
1629 * This is an optimisation. The FS_IOC_SETFLAGS ioctl return value
1630 * will be ignored since any failure of this operation should not
1631 * block the left work.
1634 if (ioctl(fd
, FS_IOC_GETFLAGS
, &attr
) == 0) {
1635 attr
|= FS_NOCOW_FL
;
1636 ioctl(fd
, FS_IOC_SETFLAGS
, &attr
);
1642 #ifdef CONFIG_POSIX_FALLOCATE
1643 case PREALLOC_MODE_FALLOC
:
1645 * Truncating before posix_fallocate() makes it about twice slower on
1646 * file systems that do not support fallocate(), trying to check if a
1647 * block is allocated before allocating it, so don't do that here.
1649 result
= -posix_fallocate(fd
, 0, total_size
);
1651 /* posix_fallocate() doesn't set errno. */
1652 error_setg_errno(errp
, -result
,
1653 "Could not preallocate data for the new file");
1657 case PREALLOC_MODE_FULL
:
1660 * Knowing the final size from the beginning could allow the file
1661 * system driver to do less allocations and possibly avoid
1662 * fragmentation of the file.
1664 if (ftruncate(fd
, total_size
) != 0) {
1666 error_setg_errno(errp
, -result
, "Could not resize file");
1670 int64_t num
= 0, left
= total_size
;
1671 buf
= g_malloc0(65536);
1674 num
= MIN(left
, 65536);
1675 result
= write(fd
, buf
, num
);
1678 error_setg_errno(errp
, -result
,
1679 "Could not write to the new file");
1688 error_setg_errno(errp
, -result
,
1689 "Could not flush new file to disk");
1695 case PREALLOC_MODE_OFF
:
1696 if (ftruncate(fd
, total_size
) != 0) {
1698 error_setg_errno(errp
, -result
, "Could not resize file");
1703 error_setg(errp
, "Unsupported preallocation mode: %s",
1704 PreallocMode_lookup
[prealloc
]);
1709 if (qemu_close(fd
) != 0 && result
== 0) {
1711 error_setg_errno(errp
, -result
, "Could not close the new file");
1718 * Find allocation range in @bs around offset @start.
1719 * May change underlying file descriptor's file offset.
1720 * If @start is not in a hole, store @start in @data, and the
1721 * beginning of the next hole in @hole, and return 0.
1722 * If @start is in a non-trailing hole, store @start in @hole and the
1723 * beginning of the next non-hole in @data, and return 0.
1724 * If @start is in a trailing hole or beyond EOF, return -ENXIO.
1725 * If we can't find out, return a negative errno other than -ENXIO.
1727 static int find_allocation(BlockDriverState
*bs
, off_t start
,
1728 off_t
*data
, off_t
*hole
)
1730 #if defined SEEK_HOLE && defined SEEK_DATA
1731 BDRVRawState
*s
= bs
->opaque
;
1736 * D1. offs == start: start is in data
1737 * D2. offs > start: start is in a hole, next data at offs
1738 * D3. offs < 0, errno = ENXIO: either start is in a trailing hole
1739 * or start is beyond EOF
1740 * If the latter happens, the file has been truncated behind
1741 * our back since we opened it. All bets are off then.
1742 * Treating like a trailing hole is simplest.
1743 * D4. offs < 0, errno != ENXIO: we learned nothing
1745 offs
= lseek(s
->fd
, start
, SEEK_DATA
);
1747 return -errno
; /* D3 or D4 */
1749 assert(offs
>= start
);
1752 /* D2: in hole, next data at offs */
1758 /* D1: in data, end not yet known */
1762 * H1. offs == start: start is in a hole
1763 * If this happens here, a hole has been dug behind our back
1764 * since the previous lseek().
1765 * H2. offs > start: either start is in data, next hole at offs,
1766 * or start is in trailing hole, EOF at offs
1767 * Linux treats trailing holes like any other hole: offs ==
1768 * start. Solaris seeks to EOF instead: offs > start (blech).
1769 * If that happens here, a hole has been dug behind our back
1770 * since the previous lseek().
1771 * H3. offs < 0, errno = ENXIO: start is beyond EOF
1772 * If this happens, the file has been truncated behind our
1773 * back since we opened it. Treat it like a trailing hole.
1774 * H4. offs < 0, errno != ENXIO: we learned nothing
1775 * Pretend we know nothing at all, i.e. "forget" about D1.
1777 offs
= lseek(s
->fd
, start
, SEEK_HOLE
);
1779 return -errno
; /* D1 and (H3 or H4) */
1781 assert(offs
>= start
);
1785 * D1 and H2: either in data, next hole at offs, or it was in
1786 * data but is now in a trailing hole. In the latter case,
1787 * all bets are off. Treating it as if it there was data all
1788 * the way to EOF is safe, so simply do that.
1803 * Returns the allocation status of the specified sectors.
1805 * If 'sector_num' is beyond the end of the disk image the return value is 0
1806 * and 'pnum' is set to 0.
1808 * 'pnum' is set to the number of sectors (including and immediately following
1809 * the specified sector) that are known to be in the same
1810 * allocated/unallocated state.
1812 * 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
1813 * beyond the end of the disk image it will be clamped.
1815 static int64_t coroutine_fn
raw_co_get_block_status(BlockDriverState
*bs
,
1817 int nb_sectors
, int *pnum
,
1818 BlockDriverState
**file
)
1820 off_t start
, data
= 0, hole
= 0;
1829 start
= sector_num
* BDRV_SECTOR_SIZE
;
1830 total_size
= bdrv_getlength(bs
);
1831 if (total_size
< 0) {
1833 } else if (start
>= total_size
) {
1836 } else if (start
+ nb_sectors
* BDRV_SECTOR_SIZE
> total_size
) {
1837 nb_sectors
= DIV_ROUND_UP(total_size
- start
, BDRV_SECTOR_SIZE
);
1840 ret
= find_allocation(bs
, start
, &data
, &hole
);
1841 if (ret
== -ENXIO
) {
1844 ret
= BDRV_BLOCK_ZERO
;
1845 } else if (ret
< 0) {
1846 /* No info available, so pretend there are no holes */
1848 ret
= BDRV_BLOCK_DATA
;
1849 } else if (data
== start
) {
1850 /* On a data extent, compute sectors to the end of the extent,
1851 * possibly including a partial sector at EOF. */
1852 *pnum
= MIN(nb_sectors
, DIV_ROUND_UP(hole
- start
, BDRV_SECTOR_SIZE
));
1853 ret
= BDRV_BLOCK_DATA
;
1855 /* On a hole, compute sectors to the beginning of the next extent. */
1856 assert(hole
== start
);
1857 *pnum
= MIN(nb_sectors
, (data
- start
) / BDRV_SECTOR_SIZE
);
1858 ret
= BDRV_BLOCK_ZERO
;
1861 return ret
| BDRV_BLOCK_OFFSET_VALID
| start
;
1864 static coroutine_fn BlockAIOCB
*raw_aio_pdiscard(BlockDriverState
*bs
,
1865 int64_t offset
, int count
,
1866 BlockCompletionFunc
*cb
, void *opaque
)
1868 BDRVRawState
*s
= bs
->opaque
;
1870 return paio_submit(bs
, s
->fd
, offset
, NULL
, count
,
1871 cb
, opaque
, QEMU_AIO_DISCARD
);
1874 static int coroutine_fn
raw_co_pwrite_zeroes(
1875 BlockDriverState
*bs
, int64_t offset
,
1876 int count
, BdrvRequestFlags flags
)
1878 BDRVRawState
*s
= bs
->opaque
;
1880 if (!(flags
& BDRV_REQ_MAY_UNMAP
)) {
1881 return paio_submit_co(bs
, s
->fd
, offset
, NULL
, count
,
1882 QEMU_AIO_WRITE_ZEROES
);
1883 } else if (s
->discard_zeroes
) {
1884 return paio_submit_co(bs
, s
->fd
, offset
, NULL
, count
,
1890 static int raw_get_info(BlockDriverState
*bs
, BlockDriverInfo
*bdi
)
1892 BDRVRawState
*s
= bs
->opaque
;
1894 bdi
->unallocated_blocks_are_zero
= s
->discard_zeroes
;
1895 bdi
->can_write_zeroes_with_unmap
= s
->discard_zeroes
;
1899 static QemuOptsList raw_create_opts
= {
1900 .name
= "raw-create-opts",
1901 .head
= QTAILQ_HEAD_INITIALIZER(raw_create_opts
.head
),
1904 .name
= BLOCK_OPT_SIZE
,
1905 .type
= QEMU_OPT_SIZE
,
1906 .help
= "Virtual disk size"
1909 .name
= BLOCK_OPT_NOCOW
,
1910 .type
= QEMU_OPT_BOOL
,
1911 .help
= "Turn off copy-on-write (valid only on btrfs)"
1914 .name
= BLOCK_OPT_PREALLOC
,
1915 .type
= QEMU_OPT_STRING
,
1916 .help
= "Preallocation mode (allowed values: off, falloc, full)"
1918 { /* end of list */ }
1922 BlockDriver bdrv_file
= {
1923 .format_name
= "file",
1924 .protocol_name
= "file",
1925 .instance_size
= sizeof(BDRVRawState
),
1926 .bdrv_needs_filename
= true,
1927 .bdrv_probe
= NULL
, /* no probe for protocols */
1928 .bdrv_parse_filename
= raw_parse_filename
,
1929 .bdrv_file_open
= raw_open
,
1930 .bdrv_reopen_prepare
= raw_reopen_prepare
,
1931 .bdrv_reopen_commit
= raw_reopen_commit
,
1932 .bdrv_reopen_abort
= raw_reopen_abort
,
1933 .bdrv_close
= raw_close
,
1934 .bdrv_create
= raw_create
,
1935 .bdrv_has_zero_init
= bdrv_has_zero_init_1
,
1936 .bdrv_co_get_block_status
= raw_co_get_block_status
,
1937 .bdrv_co_pwrite_zeroes
= raw_co_pwrite_zeroes
,
1939 .bdrv_co_preadv
= raw_co_preadv
,
1940 .bdrv_co_pwritev
= raw_co_pwritev
,
1941 .bdrv_aio_flush
= raw_aio_flush
,
1942 .bdrv_aio_pdiscard
= raw_aio_pdiscard
,
1943 .bdrv_refresh_limits
= raw_refresh_limits
,
1944 .bdrv_io_plug
= raw_aio_plug
,
1945 .bdrv_io_unplug
= raw_aio_unplug
,
1947 .bdrv_truncate
= raw_truncate
,
1948 .bdrv_getlength
= raw_getlength
,
1949 .bdrv_get_info
= raw_get_info
,
1950 .bdrv_get_allocated_file_size
1951 = raw_get_allocated_file_size
,
1953 .create_opts
= &raw_create_opts
,
1956 /***********************************************/
1959 #if defined(__APPLE__) && defined(__MACH__)
1960 static kern_return_t
GetBSDPath(io_iterator_t mediaIterator
, char *bsdPath
,
1961 CFIndex maxPathSize
, int flags
);
1962 static char *FindEjectableOpticalMedia(io_iterator_t
*mediaIterator
)
1964 kern_return_t kernResult
= KERN_FAILURE
;
1965 mach_port_t masterPort
;
1966 CFMutableDictionaryRef classesToMatch
;
1967 const char *matching_array
[] = {kIODVDMediaClass
, kIOCDMediaClass
};
1968 char *mediaType
= NULL
;
1970 kernResult
= IOMasterPort( MACH_PORT_NULL
, &masterPort
);
1971 if ( KERN_SUCCESS
!= kernResult
) {
1972 printf( "IOMasterPort returned %d\n", kernResult
);
1976 for (index
= 0; index
< ARRAY_SIZE(matching_array
); index
++) {
1977 classesToMatch
= IOServiceMatching(matching_array
[index
]);
1978 if (classesToMatch
== NULL
) {
1979 error_report("IOServiceMatching returned NULL for %s",
1980 matching_array
[index
]);
1983 CFDictionarySetValue(classesToMatch
, CFSTR(kIOMediaEjectableKey
),
1985 kernResult
= IOServiceGetMatchingServices(masterPort
, classesToMatch
,
1987 if (kernResult
!= KERN_SUCCESS
) {
1988 error_report("Note: IOServiceGetMatchingServices returned %d",
1993 /* If a match was found, leave the loop */
1994 if (*mediaIterator
!= 0) {
1995 DPRINTF("Matching using %s\n", matching_array
[index
]);
1996 mediaType
= g_strdup(matching_array
[index
]);
2003 kern_return_t
GetBSDPath(io_iterator_t mediaIterator
, char *bsdPath
,
2004 CFIndex maxPathSize
, int flags
)
2006 io_object_t nextMedia
;
2007 kern_return_t kernResult
= KERN_FAILURE
;
2009 nextMedia
= IOIteratorNext( mediaIterator
);
2012 CFTypeRef bsdPathAsCFString
;
2013 bsdPathAsCFString
= IORegistryEntryCreateCFProperty( nextMedia
, CFSTR( kIOBSDNameKey
), kCFAllocatorDefault
, 0 );
2014 if ( bsdPathAsCFString
) {
2015 size_t devPathLength
;
2016 strcpy( bsdPath
, _PATH_DEV
);
2017 if (flags
& BDRV_O_NOCACHE
) {
2018 strcat(bsdPath
, "r");
2020 devPathLength
= strlen( bsdPath
);
2021 if ( CFStringGetCString( bsdPathAsCFString
, bsdPath
+ devPathLength
, maxPathSize
- devPathLength
, kCFStringEncodingASCII
) ) {
2022 kernResult
= KERN_SUCCESS
;
2024 CFRelease( bsdPathAsCFString
);
2026 IOObjectRelease( nextMedia
);
2032 /* Sets up a real cdrom for use in QEMU */
2033 static bool setup_cdrom(char *bsd_path
, Error
**errp
)
2035 int index
, num_of_test_partitions
= 2, fd
;
2036 char test_partition
[MAXPATHLEN
];
2037 bool partition_found
= false;
2039 /* look for a working partition */
2040 for (index
= 0; index
< num_of_test_partitions
; index
++) {
2041 snprintf(test_partition
, sizeof(test_partition
), "%ss%d", bsd_path
,
2043 fd
= qemu_open(test_partition
, O_RDONLY
| O_BINARY
| O_LARGEFILE
);
2045 partition_found
= true;
2051 /* if a working partition on the device was not found */
2052 if (partition_found
== false) {
2053 error_setg(errp
, "Failed to find a working partition on disc");
2055 DPRINTF("Using %s as optical disc\n", test_partition
);
2056 pstrcpy(bsd_path
, MAXPATHLEN
, test_partition
);
2058 return partition_found
;
2061 /* Prints directions on mounting and unmounting a device */
2062 static void print_unmounting_directions(const char *file_name
)
2064 error_report("If device %s is mounted on the desktop, unmount"
2065 " it first before using it in QEMU", file_name
);
2066 error_report("Command to unmount device: diskutil unmountDisk %s",
2068 error_report("Command to mount device: diskutil mountDisk %s", file_name
);
2071 #endif /* defined(__APPLE__) && defined(__MACH__) */
2073 static int hdev_probe_device(const char *filename
)
2077 /* allow a dedicated CD-ROM driver to match with a higher priority */
2078 if (strstart(filename
, "/dev/cdrom", NULL
))
2081 if (stat(filename
, &st
) >= 0 &&
2082 (S_ISCHR(st
.st_mode
) || S_ISBLK(st
.st_mode
))) {
2089 static int check_hdev_writable(BDRVRawState
*s
)
2091 #if defined(BLKROGET)
2092 /* Linux block devices can be configured "read-only" using blockdev(8).
2093 * This is independent of device node permissions and therefore open(2)
2094 * with O_RDWR succeeds. Actual writes fail with EPERM.
2096 * bdrv_open() is supposed to fail if the disk is read-only. Explicitly
2097 * check for read-only block devices so that Linux block devices behave
2103 if (fstat(s
->fd
, &st
)) {
2107 if (!S_ISBLK(st
.st_mode
)) {
2111 if (ioctl(s
->fd
, BLKROGET
, &readonly
) < 0) {
2118 #endif /* defined(BLKROGET) */
2122 static void hdev_parse_filename(const char *filename
, QDict
*options
,
2125 /* The prefix is optional, just as for "file". */
2126 strstart(filename
, "host_device:", &filename
);
2128 qdict_put_obj(options
, "filename", QOBJECT(qstring_from_str(filename
)));
2131 static bool hdev_is_sg(BlockDriverState
*bs
)
2134 #if defined(__linux__)
2136 BDRVRawState
*s
= bs
->opaque
;
2138 struct sg_scsi_id scsiid
;
2142 if (stat(bs
->filename
, &st
) < 0 || !S_ISCHR(st
.st_mode
)) {
2146 ret
= ioctl(s
->fd
, SG_GET_VERSION_NUM
, &sg_version
);
2151 ret
= ioctl(s
->fd
, SG_GET_SCSI_ID
, &scsiid
);
2153 DPRINTF("SG device found: type=%d, version=%d\n",
2154 scsiid
.scsi_type
, sg_version
);
2163 static int hdev_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
2166 BDRVRawState
*s
= bs
->opaque
;
2167 Error
*local_err
= NULL
;
2170 #if defined(__APPLE__) && defined(__MACH__)
2171 const char *filename
= qdict_get_str(options
, "filename");
2172 char bsd_path
[MAXPATHLEN
] = "";
2173 bool error_occurred
= false;
2175 /* If using a real cdrom */
2176 if (strcmp(filename
, "/dev/cdrom") == 0) {
2177 char *mediaType
= NULL
;
2178 kern_return_t ret_val
;
2179 io_iterator_t mediaIterator
= 0;
2181 mediaType
= FindEjectableOpticalMedia(&mediaIterator
);
2182 if (mediaType
== NULL
) {
2183 error_setg(errp
, "Please make sure your CD/DVD is in the optical"
2185 error_occurred
= true;
2186 goto hdev_open_Mac_error
;
2189 ret_val
= GetBSDPath(mediaIterator
, bsd_path
, sizeof(bsd_path
), flags
);
2190 if (ret_val
!= KERN_SUCCESS
) {
2191 error_setg(errp
, "Could not get BSD path for optical drive");
2192 error_occurred
= true;
2193 goto hdev_open_Mac_error
;
2196 /* If a real optical drive was not found */
2197 if (bsd_path
[0] == '\0') {
2198 error_setg(errp
, "Failed to obtain bsd path for optical drive");
2199 error_occurred
= true;
2200 goto hdev_open_Mac_error
;
2203 /* If using a cdrom disc and finding a partition on the disc failed */
2204 if (strncmp(mediaType
, kIOCDMediaClass
, 9) == 0 &&
2205 setup_cdrom(bsd_path
, errp
) == false) {
2206 print_unmounting_directions(bsd_path
);
2207 error_occurred
= true;
2208 goto hdev_open_Mac_error
;
2211 qdict_put(options
, "filename", qstring_from_str(bsd_path
));
2213 hdev_open_Mac_error
:
2215 if (mediaIterator
) {
2216 IOObjectRelease(mediaIterator
);
2218 if (error_occurred
) {
2222 #endif /* defined(__APPLE__) && defined(__MACH__) */
2224 s
->type
= FTYPE_FILE
;
2226 ret
= raw_open_common(bs
, options
, flags
, 0, &local_err
);
2228 error_propagate(errp
, local_err
);
2229 #if defined(__APPLE__) && defined(__MACH__)
2231 filename
= bsd_path
;
2233 /* if a physical device experienced an error while being opened */
2234 if (strncmp(filename
, "/dev/", 5) == 0) {
2235 print_unmounting_directions(filename
);
2237 #endif /* defined(__APPLE__) && defined(__MACH__) */
2241 /* Since this does ioctl the device must be already opened */
2242 bs
->sg
= hdev_is_sg(bs
);
2244 if (flags
& BDRV_O_RDWR
) {
2245 ret
= check_hdev_writable(s
);
2248 error_setg_errno(errp
, -ret
, "The device is not writable");
2256 #if defined(__linux__)
2258 static BlockAIOCB
*hdev_aio_ioctl(BlockDriverState
*bs
,
2259 unsigned long int req
, void *buf
,
2260 BlockCompletionFunc
*cb
, void *opaque
)
2262 BDRVRawState
*s
= bs
->opaque
;
2263 RawPosixAIOData
*acb
;
2266 if (fd_open(bs
) < 0)
2269 acb
= g_new(RawPosixAIOData
, 1);
2271 acb
->aio_type
= QEMU_AIO_IOCTL
;
2272 acb
->aio_fildes
= s
->fd
;
2273 acb
->aio_offset
= 0;
2274 acb
->aio_ioctl_buf
= buf
;
2275 acb
->aio_ioctl_cmd
= req
;
2276 pool
= aio_get_thread_pool(bdrv_get_aio_context(bs
));
2277 return thread_pool_submit_aio(pool
, aio_worker
, acb
, cb
, opaque
);
2281 static int fd_open(BlockDriverState
*bs
)
2283 BDRVRawState
*s
= bs
->opaque
;
2285 /* this is just to ensure s->fd is sane (its called by io ops) */
2291 static coroutine_fn BlockAIOCB
*hdev_aio_pdiscard(BlockDriverState
*bs
,
2292 int64_t offset
, int count
,
2293 BlockCompletionFunc
*cb
, void *opaque
)
2295 BDRVRawState
*s
= bs
->opaque
;
2297 if (fd_open(bs
) < 0) {
2300 return paio_submit(bs
, s
->fd
, offset
, NULL
, count
,
2301 cb
, opaque
, QEMU_AIO_DISCARD
|QEMU_AIO_BLKDEV
);
2304 static coroutine_fn
int hdev_co_pwrite_zeroes(BlockDriverState
*bs
,
2305 int64_t offset
, int count
, BdrvRequestFlags flags
)
2307 BDRVRawState
*s
= bs
->opaque
;
2314 if (!(flags
& BDRV_REQ_MAY_UNMAP
)) {
2315 return paio_submit_co(bs
, s
->fd
, offset
, NULL
, count
,
2316 QEMU_AIO_WRITE_ZEROES
|QEMU_AIO_BLKDEV
);
2317 } else if (s
->discard_zeroes
) {
2318 return paio_submit_co(bs
, s
->fd
, offset
, NULL
, count
,
2319 QEMU_AIO_DISCARD
|QEMU_AIO_BLKDEV
);
2324 static int hdev_create(const char *filename
, QemuOpts
*opts
,
2329 struct stat stat_buf
;
2330 int64_t total_size
= 0;
2333 /* This function is used by both protocol block drivers and therefore either
2334 * of these prefixes may be given.
2335 * The return value has to be stored somewhere, otherwise this is an error
2336 * due to -Werror=unused-value. */
2338 strstart(filename
, "host_device:", &filename
) ||
2339 strstart(filename
, "host_cdrom:" , &filename
);
2343 ret
= raw_normalize_devicepath(&filename
);
2345 error_setg_errno(errp
, -ret
, "Could not normalize device path");
2349 /* Read out options */
2350 total_size
= ROUND_UP(qemu_opt_get_size_del(opts
, BLOCK_OPT_SIZE
, 0),
2353 fd
= qemu_open(filename
, O_WRONLY
| O_BINARY
);
2356 error_setg_errno(errp
, -ret
, "Could not open device");
2360 if (fstat(fd
, &stat_buf
) < 0) {
2362 error_setg_errno(errp
, -ret
, "Could not stat device");
2363 } else if (!S_ISBLK(stat_buf
.st_mode
) && !S_ISCHR(stat_buf
.st_mode
)) {
2365 "The given file is neither a block nor a character device");
2367 } else if (lseek(fd
, 0, SEEK_END
) < total_size
) {
2368 error_setg(errp
, "Device is too small");
2376 static BlockDriver bdrv_host_device
= {
2377 .format_name
= "host_device",
2378 .protocol_name
= "host_device",
2379 .instance_size
= sizeof(BDRVRawState
),
2380 .bdrv_needs_filename
= true,
2381 .bdrv_probe_device
= hdev_probe_device
,
2382 .bdrv_parse_filename
= hdev_parse_filename
,
2383 .bdrv_file_open
= hdev_open
,
2384 .bdrv_close
= raw_close
,
2385 .bdrv_reopen_prepare
= raw_reopen_prepare
,
2386 .bdrv_reopen_commit
= raw_reopen_commit
,
2387 .bdrv_reopen_abort
= raw_reopen_abort
,
2388 .bdrv_create
= hdev_create
,
2389 .create_opts
= &raw_create_opts
,
2390 .bdrv_co_pwrite_zeroes
= hdev_co_pwrite_zeroes
,
2392 .bdrv_co_preadv
= raw_co_preadv
,
2393 .bdrv_co_pwritev
= raw_co_pwritev
,
2394 .bdrv_aio_flush
= raw_aio_flush
,
2395 .bdrv_aio_pdiscard
= hdev_aio_pdiscard
,
2396 .bdrv_refresh_limits
= raw_refresh_limits
,
2397 .bdrv_io_plug
= raw_aio_plug
,
2398 .bdrv_io_unplug
= raw_aio_unplug
,
2400 .bdrv_truncate
= raw_truncate
,
2401 .bdrv_getlength
= raw_getlength
,
2402 .bdrv_get_info
= raw_get_info
,
2403 .bdrv_get_allocated_file_size
2404 = raw_get_allocated_file_size
,
2405 .bdrv_probe_blocksizes
= hdev_probe_blocksizes
,
2406 .bdrv_probe_geometry
= hdev_probe_geometry
,
2408 /* generic scsi device */
2410 .bdrv_aio_ioctl
= hdev_aio_ioctl
,
2414 #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2415 static void cdrom_parse_filename(const char *filename
, QDict
*options
,
2418 /* The prefix is optional, just as for "file". */
2419 strstart(filename
, "host_cdrom:", &filename
);
2421 qdict_put_obj(options
, "filename", QOBJECT(qstring_from_str(filename
)));
2426 static int cdrom_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
2429 BDRVRawState
*s
= bs
->opaque
;
2433 /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
2434 return raw_open_common(bs
, options
, flags
, O_NONBLOCK
, errp
);
2437 static int cdrom_probe_device(const char *filename
)
2443 fd
= qemu_open(filename
, O_RDONLY
| O_NONBLOCK
);
2447 ret
= fstat(fd
, &st
);
2448 if (ret
== -1 || !S_ISBLK(st
.st_mode
)) {
2452 /* Attempt to detect via a CDROM specific ioctl */
2453 ret
= ioctl(fd
, CDROM_DRIVE_STATUS
, CDSL_CURRENT
);
2463 static bool cdrom_is_inserted(BlockDriverState
*bs
)
2465 BDRVRawState
*s
= bs
->opaque
;
2468 ret
= ioctl(s
->fd
, CDROM_DRIVE_STATUS
, CDSL_CURRENT
);
2469 return ret
== CDS_DISC_OK
;
2472 static void cdrom_eject(BlockDriverState
*bs
, bool eject_flag
)
2474 BDRVRawState
*s
= bs
->opaque
;
2477 if (ioctl(s
->fd
, CDROMEJECT
, NULL
) < 0)
2478 perror("CDROMEJECT");
2480 if (ioctl(s
->fd
, CDROMCLOSETRAY
, NULL
) < 0)
2481 perror("CDROMEJECT");
2485 static void cdrom_lock_medium(BlockDriverState
*bs
, bool locked
)
2487 BDRVRawState
*s
= bs
->opaque
;
2489 if (ioctl(s
->fd
, CDROM_LOCKDOOR
, locked
) < 0) {
2491 * Note: an error can happen if the distribution automatically
2494 /* perror("CDROM_LOCKDOOR"); */
2498 static BlockDriver bdrv_host_cdrom
= {
2499 .format_name
= "host_cdrom",
2500 .protocol_name
= "host_cdrom",
2501 .instance_size
= sizeof(BDRVRawState
),
2502 .bdrv_needs_filename
= true,
2503 .bdrv_probe_device
= cdrom_probe_device
,
2504 .bdrv_parse_filename
= cdrom_parse_filename
,
2505 .bdrv_file_open
= cdrom_open
,
2506 .bdrv_close
= raw_close
,
2507 .bdrv_reopen_prepare
= raw_reopen_prepare
,
2508 .bdrv_reopen_commit
= raw_reopen_commit
,
2509 .bdrv_reopen_abort
= raw_reopen_abort
,
2510 .bdrv_create
= hdev_create
,
2511 .create_opts
= &raw_create_opts
,
2514 .bdrv_co_preadv
= raw_co_preadv
,
2515 .bdrv_co_pwritev
= raw_co_pwritev
,
2516 .bdrv_aio_flush
= raw_aio_flush
,
2517 .bdrv_refresh_limits
= raw_refresh_limits
,
2518 .bdrv_io_plug
= raw_aio_plug
,
2519 .bdrv_io_unplug
= raw_aio_unplug
,
2521 .bdrv_truncate
= raw_truncate
,
2522 .bdrv_getlength
= raw_getlength
,
2523 .has_variable_length
= true,
2524 .bdrv_get_allocated_file_size
2525 = raw_get_allocated_file_size
,
2527 /* removable device support */
2528 .bdrv_is_inserted
= cdrom_is_inserted
,
2529 .bdrv_eject
= cdrom_eject
,
2530 .bdrv_lock_medium
= cdrom_lock_medium
,
2532 /* generic scsi device */
2533 .bdrv_aio_ioctl
= hdev_aio_ioctl
,
2535 #endif /* __linux__ */
2537 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
2538 static int cdrom_open(BlockDriverState
*bs
, QDict
*options
, int flags
,
2541 BDRVRawState
*s
= bs
->opaque
;
2542 Error
*local_err
= NULL
;
2547 ret
= raw_open_common(bs
, options
, flags
, 0, &local_err
);
2549 error_propagate(errp
, local_err
);
2553 /* make sure the door isn't locked at this time */
2554 ioctl(s
->fd
, CDIOCALLOW
);
2558 static int cdrom_probe_device(const char *filename
)
2560 if (strstart(filename
, "/dev/cd", NULL
) ||
2561 strstart(filename
, "/dev/acd", NULL
))
2566 static int cdrom_reopen(BlockDriverState
*bs
)
2568 BDRVRawState
*s
= bs
->opaque
;
2572 * Force reread of possibly changed/newly loaded disc,
2573 * FreeBSD seems to not notice sometimes...
2577 fd
= qemu_open(bs
->filename
, s
->open_flags
, 0644);
2584 /* make sure the door isn't locked at this time */
2585 ioctl(s
->fd
, CDIOCALLOW
);
2589 static bool cdrom_is_inserted(BlockDriverState
*bs
)
2591 return raw_getlength(bs
) > 0;
2594 static void cdrom_eject(BlockDriverState
*bs
, bool eject_flag
)
2596 BDRVRawState
*s
= bs
->opaque
;
2601 (void) ioctl(s
->fd
, CDIOCALLOW
);
2604 if (ioctl(s
->fd
, CDIOCEJECT
) < 0)
2605 perror("CDIOCEJECT");
2607 if (ioctl(s
->fd
, CDIOCCLOSE
) < 0)
2608 perror("CDIOCCLOSE");
2614 static void cdrom_lock_medium(BlockDriverState
*bs
, bool locked
)
2616 BDRVRawState
*s
= bs
->opaque
;
2620 if (ioctl(s
->fd
, (locked
? CDIOCPREVENT
: CDIOCALLOW
)) < 0) {
2622 * Note: an error can happen if the distribution automatically
2625 /* perror("CDROM_LOCKDOOR"); */
2629 static BlockDriver bdrv_host_cdrom
= {
2630 .format_name
= "host_cdrom",
2631 .protocol_name
= "host_cdrom",
2632 .instance_size
= sizeof(BDRVRawState
),
2633 .bdrv_needs_filename
= true,
2634 .bdrv_probe_device
= cdrom_probe_device
,
2635 .bdrv_parse_filename
= cdrom_parse_filename
,
2636 .bdrv_file_open
= cdrom_open
,
2637 .bdrv_close
= raw_close
,
2638 .bdrv_reopen_prepare
= raw_reopen_prepare
,
2639 .bdrv_reopen_commit
= raw_reopen_commit
,
2640 .bdrv_reopen_abort
= raw_reopen_abort
,
2641 .bdrv_create
= hdev_create
,
2642 .create_opts
= &raw_create_opts
,
2644 .bdrv_co_preadv
= raw_co_preadv
,
2645 .bdrv_co_pwritev
= raw_co_pwritev
,
2646 .bdrv_aio_flush
= raw_aio_flush
,
2647 .bdrv_refresh_limits
= raw_refresh_limits
,
2648 .bdrv_io_plug
= raw_aio_plug
,
2649 .bdrv_io_unplug
= raw_aio_unplug
,
2651 .bdrv_truncate
= raw_truncate
,
2652 .bdrv_getlength
= raw_getlength
,
2653 .has_variable_length
= true,
2654 .bdrv_get_allocated_file_size
2655 = raw_get_allocated_file_size
,
2657 /* removable device support */
2658 .bdrv_is_inserted
= cdrom_is_inserted
,
2659 .bdrv_eject
= cdrom_eject
,
2660 .bdrv_lock_medium
= cdrom_lock_medium
,
2662 #endif /* __FreeBSD__ */
2664 static void bdrv_file_init(void)
2667 * Register all the drivers. Note that order is important, the driver
2668 * registered last will get probed first.
2670 bdrv_register(&bdrv_file
);
2671 bdrv_register(&bdrv_host_device
);
2673 bdrv_register(&bdrv_host_cdrom
);
2675 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2676 bdrv_register(&bdrv_host_cdrom
);
2680 block_init(bdrv_file_init
);